Device for determining and/or monitoring a predetermined...

G - Physics – 01 – F

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G01F 23/22 (2006.01) G01F 23/296 (2006.01)

Patent

CA 2150855

The determination and/or monitoring of a predetermined material level in a container is effected with the help of a material level sensor which contains a mechanical oscillatory structure, an electromechanical excitation transducer and two electro- mechanical reception transducers. The mechanical oscillatory structure is secured at the height of the predetermined mate- rial level in such a way that it comes into contact with the material when said material reaches the predetermined material level. Each reception transducer is connected to the input of an assigned circuit channel, which contains an amplifier cir- cuit, the output of which is connected to the excitation trans- ducer and which is so constructed that the mechanical oscilla- tory structure is excited to produce oscillations with its natural resonance frequency. The two circuit channels are acti- vated alternately by means of a control circuit. Furthermore, each circuit channel contains a measuring signal transducer which produces a measuring signal which on the one hand con- tains the information about the frequency of the output signal of the amplifier circuit, and to which on the other hand an identifier assigned to the circuit channel has been added, said identifier being different from the identifier assigned to the other circuit channel.

Il est possible de déterminer ou de contrôler un niveau de matière prédéterminé dans un contenant au moyen d'un capteur comportant une structure oscillatoire mécanique, un transducteur électromécanique d'excitation et deux transducteurs électromécaniques de réception. La structure oscillatoire mécanique est située au plus haut niveau prédéterminé de matière, de manière à être en contact avec celle-ci lorsqu'elle atteint le niveau prédéterminé. Chaque transducteur de réception est relié à l'entrée d'un canal circuit assigné, qui comporte un circuit amplificateur dont la sortie est reliée au transducteur d'excitation et qui est construit de manière que la structure oscillatoire mécanique soit excitée pour produire des oscillations au moyen de sa fréquence de résonance propre. Un circuit de commande active en alternance les deux canaux circuits. Chaque canal circuit comporte aussi un transducteur de signal de mesure qui produit un signal de mesure contenant l'information sur la fréquence du signal de sortie du circuit amplificateur, et auquel a été ajouté un identificateur assigné au canal circuit, cet identificateur étant différent de celui assigné à l'autre canal circuit.

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